General bacterial porin family. General bacterial porins are a family of proteins from the outer membranes of Gram-negative bacteria. The porins act as molecular filters for hydrophilic compounds.[1] They are responsible for the 'molecular sieve' properties of the outer membrane.
About the CFR. The Code of Federal Regulations (CFR) is an annual codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.
Concession / Commission Fee Recovery (CFR) / Concession Recovery Surcharge Fee - This fee is to reimburse Thrifty for concession/commission fees paid to the airport (hotel, train station, base or agent) for each rental.